#15262: Correct logic for cover tests.

Author: tkiseleva

ui/widgets/slider.js

@@ -556,7 +556,7 @@ return $.widget( "ui.slider", $.ui.mouse, {
 		max = parseFloat( max.toFixed( this._precision() ) );
 		var optionMax = parseFloat( this.options.max.toFixed( this._precision() ) );
 
-		if ( this.options.includeMax ) {
+		if ( this.options.includeMax && this.options.includeMax === true) {
 			if ( max < optionMax ) {
 
 				// If max is not divisible by step and max from options